Reinforced concrete construction.



J. WUNDER.

REINFORCED CONCRETE CONSTRUCTION.

AP\PLICATION man FEB 21. i913.

11. ama, Patented; Nov; 27, 19121 4- SHEETS-SHEET L 777M J'dW/V wumoma 3L QM G MQ WM\ htemed Nov. 2?, 191?.

4 SHEETS-SHEET 2.

J. WUNDER.

REHNFORCED CONCRETE CONSTRUCTION.

APPLICATION FILED FEB-2! mmwn J. WUNDER.

REINFORCED CONCRETE CONSTRUCTION.

- APPLICATION FILED FEB- 21, i9l3.

E gg q g Patentefl Nov. 27, 1917,

4 SHEETSSHEET 3- J. WUNDER.

REINFORCED CONCRETE CONSTRUCTION.

- APPLICATION FILED FEB-21.1913. Patented Nov. 2!, 191?.

4 SHEETS-SHEET 4- Q Q m M M W {O u 6 MW w MW i Mm iris snares ranrrrion;

JOHN WUNIDEE, 0F MINNEAPOLIS, MINNESOTA.

REINFORCED CONCRETE CONSTRUCTION.

Laaaoaa.

Specification of Letters Patent. Pa tgntd Nuiv, 27, 119117,

Application filed Februar 21, 1913, Serial No. 749,879.

To all whom it may concern.

Be it known that 1, JOHN WVUNDER, a citizen of the United States,resident of Minneapolis, in the county of Hennepin and State provide afiat slab construction in which the beams or girders which arepreferably employed are concealed within the structure of the floorslab, so that the floor slab presents preferably a flat, unbrokensurface, both at the top and at the bottom. Some features of theinvention may, however, be employed in those flat slab constructionswhich do not employ any beams or girders, but are of what is known asthe flat slab cantaliver relnforcement, a

construction.

Another object of theinvention is to pro-- vide a construction thatfurnishes in proximity to the columns means for carrying service pipessuch as thoseused for lighting systems, water supply and sewerage.

Another object of the invention is to provide in connection with theflat slab floor a. suspended ceiling between which and said floorheating and ventilating conduits may be arranged.

Other objects of the invention will appear from the following detaileddescription,

taken in connection with the accompanying drawings, of which,

Figure 1 is a vertical section of a portion of a flat slab floor andreinforced supporting column, embodying my invention,

Fig. 2 is a section of a portion of one of the column plates, showingthe arrangement of compression andtension members of the concealed beamin reference thereto,

Fig. 3 is a vertical section of one of the column plates with anelevation of one of the cantaliver tension members of the concealedbeam,

Fig. 4 is a section of a column plate with an elevation of one of theshear members arranged in connection therewith,

' Fig. 10,

Fig. 5 is a plan view,

Fig. 6 is a transverse vertical section of one of the column plates,

Fig. 7 is a plan View of a portion of a flat slab floor embodying myinvention, illustrating-the use of a series of hollow tile in saidfloor,

Fig. 8 is a transverse section on line 8, 8 of Fig. 7,

Fig. 9 is a plan View showing one of the column plates and thearrangement of the reinforcing members where they pass through thecolumn, and reinforcing members of concealedbeams and showing in dottedlines the location of the tile similar to those shown in Figs. 7 and 8,and also showing their relation to the concealed beamsof the floor, I

Fig. 10 is a plan view of a portion of a floor showing four columns withthe concealed beams extending directly between columns and with thepanels supported upon the concealed beams by suitable two-way Fig. 11 isa section on line 11-11 in Fig. 12 is a detail section showing theconnection of the slab to a side wall of the building,

Fig. 13 is a vertical section of a portion of the floor and column shownin Fig. 1 and also showing a suspended ceiling providing a space withinwhich service pipes or conduits may be arranged and also showing thearrangement of vertical pipes in relation to y the column and columnplates,

Fig. 14 is a plan view of the column plate andcoluinn rods shown in Fig.13, and

showing also the arrangement of the service pipes in relation thereto. 1

In all of the drawings A represents one of the floor supporting columns,B represents a portion of one "of the flat slabs supported upon andpreferably formed integrally with the series of columns A, and Crepresents a ceiling suitably supported from the floor B as hereinafterdescribed, thereby providing between said ceiling and the under surfaceof the floor slab a space within which service pipes or conduits may bearranged.

The column A may be formed in any suitable manner. I prefer to provide aseries of column reinforcing rods 1, surrounded by spirally arrangedrods or wires 2, said rods and wires being embedded in the concrete ofthe columns, which may be done in any suitable or preferred manner.

I provide at the top of each column section, and arranged preferablywith its under surface flush with' the under surface of the floor slab asupportingplate D. This plate as herein shown in Figs. 5, 9V and 14:, isof substantially rectangular form with thecorners omitted, but it willbe understood that it may be of circularor other shape.

The column plate D is preferably provided with a centralopening 3,through which the concrete forthe column may be poured, and also with aseries of openings t through which the column rods 1 extend. A verticalflange 5 rises from the surface of the plate D and surrounds the holes4. This flange is herein shown as substantially rectangular in outlineas shown in, Figs. 6, 9 and 14; of the drawings. Whether of this form orcir-' cular in outline the flange 5 surrounds the holes 3 and saidflange extends upwardly from the main portion of the plate D and hasformed integrallywith it radial or sub.-

- stantially radial flanges 6. Outside of the lighting conduits (eitherelectrical-or gas),

flange 5 and between the flanges 6 are the series of openings 7. Theseopenings are provided to permit the vertical service pipes, such as thesoil pipes, sprinkling pipes,

water pipes, and any other pipesor condu ts that it is desired tohavearranged in proximity to the column, to pass.

While the plate itself assists in resisting shearing stresses, I preferto provide addi-v tional shearing members E, extendingacrosssaidplateand arranged at right angles to each other. Each shearingmember E is preferably formed of a rod 8 having its ends doubled backand extending parallel to the main portion of the rod, said parallelportions being preferably connected by the lacing wires 9 preferablyarrangedso as to extend diagonally between said parallel portions oftherod 8; as shown clearly in Fig, 4 of the drawings. The shearingmembers E are preferably arranged so as to extend at right angles toeach other as shown i-nFig. 9 of the drawings with the free ends of .the

' rods bearing against the outer upright wall of the flange .5, and withthe lower portion of said rod resting upon the upper surface of the,plate D between the radial flanges 6 a (see Fig. 4,).

This arrangement of the members in-relation to the flanged plates Dprovides: an

especially efiective resistancetoboth Verti cal and horizontal shear.

I zpreferably' provide concealed beams extending at right angles to eachother and directly through the slab. from column to column, therebydividing up the floor slab into a series of rectangular panels. Theportions of the slab constituting said panels are carried by saidconcealed beams, and said panels are made up entirely of reinforcedconcrete, the reinforcing slab rods ail being arranged as a two-wayreinforcement, as shownin Figs. 10 and 11, or said panels areconstituted of reinforced concrete slabs with hollow tile 42embfifildodtherein, as shown in Figs. 7 and 8.. l 1

For the reinforcement of the concealed beams I preferably provide aseriesof pairs of cantaliver rods 10 and 11, both of which extendthrough the lower portions of the beam, the lowerjlQd extendingnpwardlywhere it passes over or through the column sufficiently to passover and rest upon the top of the vertical flange .5of:the column plateD (see Figs. 1 and 3),'but otherwiseextending parallel to the lowersurface of the slab and concealed beam-and only a short distance abovesaid lower surface. i

The other cantaliver rod 11 extends through the central portion oftheconcealed beam, parallel to "the rod 10, and preferably only'a;

slight distance above it, but at, substantially thepointsofcontraflexure of the concealed beam this rod extendsupwardly to.points near the top of the slab and concealed beam and then extendshorizontally. through the column parallel to the upperand lower surfacesof the slab. This arrangement pro- 5, or the plate D. In addition Ihareshown two of such rods extending in eachdirection outside of theouteredge of the plate D.

It will be understood, however, that the 1 number and size of these rodsmaybe varied to-su t the particularcharacter of the structure that. sbeing erected.

Arranged preferably in the same plane with the cantaliver beam rods 10and 11, I

provide. a series of'rods18j that extend the full length of the beam.near theupper surface. of the concealed beam and slab. These 7 rods areclearly shown in Figs. 1 and 3 of the drawings. They extend at rightangles 1 to each other and constitute the outerand upper members. ofeach concealedbeam.

It will-be seen that the portions of the rods 10 and-11,between thepoints of contrafiexure of each beam section constitutes tensionmembers, while the portions of the rods 13 between said points,constitute compression members. i

I also prefer to provide additional ten sion and compression members,the former consisting of therods 14, having at their ends hooks 15 whichhook over the verti cal flange 5 of the column'plate D (see Fig. 2 ofthe drawings), and the compression members consisting of the rods 16Whose ends abut against the outer surfaces of said flanges 5. These rodsare preferably tied together by a suitable wire 1.7, where they crosseach other, and they are further secured by lacing wires 18 clearlyshown in Fig. 2 of the drawings.

I prefer to alternate the rods 14: and 16 with the rods 10, 11 and 13,as shown in Fig. 9 of the drawings. Any desired number of these membersmay be employed.

Where no service pipes are to be arranged in connection with the columnplates D no attention need be paid in placing the reinforcing rods forthe concealed beams, to the holes in the plates D, designed toaccommodate such service pipes, and in Fig. 9 of the drawings I haveshown the concealed beam reinforcing rods extending across suchopenings.

In Figs. 18 and 14: of the drawings I have illustrated service pipesextending through certain of the openings in the plate D and in thisinstance the concealed beam reinforcing rods are arranged so as not tointerfere with the passage of said pipes through said openings.

In Figs. 13, and 14, of the drawings, I have illustrated a suspendedceiling C, con sisting preferably of suitable sheets of eX panded metalor netting, and suspended by rods from the slab B and thereby forming aspace within which horizontal air ducts 21 and 22 may be arranged and inwhich also horizontal portions of service pipes 23, 2-1, 25, 26, 27 and28, may be eX- tended, the vertical portions of these pipes extendingthrough the openings 7 in the plate D.

I do not limit myself, however, to any particular number or character ofthe service pipes that may be arranged within the space between thefloor slab and the suspended ceiling or that may pass through theopening 7 in the column plates D.

It will be noted that I provide an exceedingly simple and efiicientreinforced con struction in which all of the stresses are taken care ofin a scientific manner, while at the same time in each instance a flatslab floor without visible beams is produced. At

ing.

the same time provision is made for the arrangement of service pipes injuxtaposition to the columns, and where the suspended ceiling isemployed such service pipes may extend from any column to any otherdesired part of the structure and heating and ventilating conduits maybe provided which are easily concealed by the suspended ceil- By usingthehollow tile for the rectangular panels between the concealed beams alight floor is provided which decreases the weight carried by thecolumns without decreasing the strength of the floors.

I have described the invention as applied to structures having the floorslab supported upon reinforced concrete columns with verticalreinforcing rods extending vertically through the column that are inalinement with one another. It will be understood however, that manyfeatures of the invention may be employed when the floor slabs aresupported upon metal columns or upon columns formed of structural ironor steel incased in concrete. I do not wish therefore to be limited tothe use in all instances of columns formed of reinforced concrete.

The details of the construction may be varied in many particularswithout departing from my invention.

I claim as my invention:

1. In a reinforced concrete structure, the combination, with a series ofcolumns and a reinforced fiat floor slabsupported thereon, of metalplates arranged at the tops of the columns and extending laterallybeyond the outer faces thereof into the floor slab, each of said plateshaving a vertical rectangular flange 5 provided upon its upper surface,tension rods 1% extending directly from column column in the lower partof the floor slab and having hooked ends 15 en gaging the flange 5 onsaid metal plate, and compression members 16 also extending directlyfrom column to column in the upper part of the slab and having theirends engaging the outer surfaces of the flanges 5, and means forsupporting upon said bean: rods the rectangular panels formed betweenthem.

2. In a reinforced concrete structure, the combination, with a series ofcolumns and a reinforced fiat floor slab supported thereon, of metalplates arranged at the tops of the columns and extending laterallybeyond the outer faces thereof into the floor slab, each of said plateshaving holes in the pertions thereof that are outside of the faces ofthe columns, a ceiling suspended from the underside of said floor slaband arranged with a space between its upper sur face and the undersurface of the floor slab, whereby service pipes extending In Witnesswhereof l; have hereunto set my hand this 17th day of February 1913.

JOHN WUNDER.

through the floor slabin proximity to the column may be arranged topass, through the holes in said metal plates, and portions of said pipesmay be extended laterally into, the space between the underside of thefloor slab and the upper surface of the suspended ceiling.

l/Vitnesses V H. ADOLPHUS PETERSEN, EDWARD A. PAUL.

Copies of this patent may be obtained for five gents each, by addressingthe Gpanmiss ioner of Patents. Washington; D. 0.

